Process for the oxidation protection of fibre reinforced composites

摘要

Process for the oxidation protection of a fiber-reinforced carbon-containing composite material comprises: impregnating the composite material with an aqueous phosphate-containing solution; and after drying, heat treating at a temperature sufficient to convert the dried solution into non-soluble compounds suitable for forming a self-sealing glass. The composite material has a matrix containing, apart from silicon carbide, silicon and/or silicon alloys in the edge layer. The composite material is oxidized before the first step, between the two steps of during or after the second step to form silicon dioxide. An Independent claim is also included for a treated fiber-reinforced carbon-containing composite material. Preferred Features: The oxidation treatment is carried out in air or by using a wet chemical treatment. The aqueous solution is an aluminum phosphate solution, preferably containing at least 15 wt.% mono-aluminum phosphate (Al(H2(PO4)3).